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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6863cb1c3ab8214f4ae9d5b0d7fb485309bd6fbeebc2b55fcc5d78b9f6c78937' 
  AND token = '4VrNclQkeGvSIEErN103JNu8mUoFMURa8jPmSmFyXdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}